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Macroinvertebrate Inventory of the Caspar Creek Watershed

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Macroinvertebrate Inventory of the Caspar Creek Watershed FINAL REPORT: Macroinvertebrate Inventory of the Caspar Creek Watershed Kenneth W. Cummins1 and David Malkauskas2 1. California Cooperative Fisheries Research Unit, Humboldt State University 2. Department of Entomology, Michigan State University 1 Introduction A macroinvertebrate assessment was conducted on the Caspar Creek Experimental Watershed in northwestern California using a functional feeding group (FFG) classification. The approach, developed over 30 years ago (Cummins 1973), has been tested, modified, and employed in many studies (e.g. Cummins and Klug 1979, Cummins and Wilzbach 1985), Merritt and Cummins 2006). The approach categorizes macroinvertebrates based on their morphological and behavioral mechanisms by which they acquire one or more of six general food types: coarse particulate organic matter (CPOM), fine particulate organic matter (FPOM), periphytic, non-filamentous algae and associated bio-film, invertebrate prey organisms, and filamentous algae (Table 1). The morpho-behavioral adaptations of stream macroinvertebrates for acquiring food are easily observed in the field on live specimens. An example is the large eyes, bright color patterns, and active movement that characterize the three predaceous stonefly families (setipalpian Plecoptera). The abundance (especially expressed as biomass) of any FFG is an indicator of the relative availability of its food resource category. The method has the advantage that the survey crew leaves the field with the data as well as with preserved samples that can be analyzed in taxonomic data, and measured for biomass conversion calculations in the lab, if (and this is almost always the problem) funds are available for the very time-consuming process of microscope analysis. The point is, that a great deal of information about the status of a stream ecosystem can be obtained in the field using the FFG approach, but it does not for close the ability to analyze the samples in the lab. The field numbers can be converted to biomass using length-mass regressions, or to calculate any of the commonly used indices of stream condition (e.g. % Ephemeroptera, Plecoptera, and Trichoptera in a sample). Ecological tables in Merritt et al. (2008) provide information of the functional feeding group categorization of essentially every genus of North American aquatic insect. Information in Pennak (1989) can be used to assign non-insect invertebrates to functional groups. Methods The FFG field approach was used to rapidly characterize the North and South Branch tributaries and the Mainstem of Caspar Creek with regard to a number of ecosystem attributes of each. Field collections, together with laboratory analysis, were used to compile a taxonomic list of stream invertebrates for Caspar Creek. The samples taken in May and October of 2008 were compared to those taken by Bottorff and Knight (1996) from 1986 through 1994 to determine if taxonomic changes had occurred (Appendix 1). Timed 30 second samples were taken with a D-frame dip net (250µm mesh) in three habitats: riffle (coarse sediments), pools and backwaters (fine sediments), and plant litter accumulations (drop and trap zones). Three samples were taken pseudo- randomly (i.e. haphazardly) in each habitat type at locations along a 50 meter reach of stream at five locations. The sites were: upper and lower North Fork, lower South Fork, and upper and lower Mainstem (Fig. 1). The samples were sorted fresh at stream side primarily with the unaided eye but with some small specimens checked using a 5X hand lens. The 2 invertebrates were sorted into functional groups (Table 1) and the numbers in each discernable taxon recorded. A small portion of a sample was examined at a time in a white enamel tray. After sorting a tallying the invertebrates, the sample was placed in a Whirlpac™ bag, labeled, and preserve with 75% ethanol for return to the lab. Large mineral substrates and pieces of wood were thoroughly washed and discarded. The fine sediments were placed in a bucket agitated and repeatedly decanted onto a 250µm mesh sieve until no more light materials were visible in the wash. The litter samples were examined piece by piece, small portions at a time. The average processing time for a field sample was 1 to 2 hours. In the laboratory, each sample was examined under a dissecting microscope and specimens were identified (using Merritt et al. 2008 and Pennak 1989) and measured to the nearest mm. The number of specimens of a given taxon in each mm size category was used to convert the numbers to dry biomass using the INVERTCALC program (Cummins, Merritt and Kolouch, Humboldt State University). Each taxon is coded, allowing the data on that taxon to be tabulated by functional group. Once the data had been summarized, a number of ratios of functional groups are used as surrogates for selected stream ecosystem attributes (Table 2). The ratios were calculated for the three habitats for each of the 5 sites for the fall samples (Table 3). Because the major analysis utilized dimensionless ratios, the resulting values are fairly independent of sample size. Particular emphasis was placed on the characteristics of the riparian vegetation cover at each sample site, i.e. percent shading and relative proportion of evergreens to deciduous trees. Results Using the proposed threshold values for the functional group surrogate ratio for the autotrophic/heterotrophic (P/R) index (i.e. > 0.75 = autotrophic, Merritt et al. 1996, 2002, 2008). This ecosystem attribute(P?R) is directly measured as the ratio of gross primary production to total community respiration. The Caspar Creek water shed is heterotrophic (Table 3). This is as expected because the stream is heavily shaded throughout the drainage and nearly canopy closed along the North and South Forks and the Upper Mainstem. The riparian is dominated by second growth conifers and the colonizing hardwood red alder. The South Fork is bordered by relatively more red alder, but the entire drainage has a mix of evergreens and deciduous hardwoods. The expected shredder index (Table 2), which reflects the abundance of coarse organic litter (CPOM) relative to fine organic litter (FPOM), was well above 0.50 at all sites in October. As expected, the values were highest in the litter samples, but since coarse litter can be trapped or deposited in any of the habitats, shedders were wildly distributed. Therefore, taken together, the macroinvertebrate surrogate ratios for P/R and CPOM/FPOM (Table 3) characterize Caspar Creek as an heterotrophic ecosystem with a litter supply that supports a strong linkage between the riparian vegetation and shredder macroinvertebrates. If the presence – absence taxonomic data from Botteroff and Knight (B and K, 1996) are compared to that for the present study (PS) in 2008 (Appendix Table) for the functional group surrogate P/R ratio, both indicate Caspar Creek is heterotrophic (i.e. < 0.75). The ratios are essentially the same: B and K = 0.33 and PS = 0.35. Similarly, the surrogate for 3 CPOM/FPOM indicates a normal linkage between shredders and riparian litter for an heterotrophic system (i.e. > 0.50; B and K = 0.59, PS = 0.69). This is in agreement with the sample data from the present study (Table 3) in which the surrogate ratios ranged from 0.78 to 30.40 for the five sites. The ratio of suspended FPOM to benthic FPOM as indicated by the functional group surrogate (Table 3) is below or at the threshold value of 0.25 (B and K = 0.15, PS = 0.26). This lack of suspended FPOM in the system is likely a partial explanation for the poor representation by filtering collectors in Caspar Creek (Table 3, Appendix Table). Not only the quantity of FPOM in transport but also its quality as a food resource could be limiting the filtering collectors. The availability of stable substrates, i.e. coarse sediments in riffles, large wood, and rooted aquatic vascular plants, as measured by the functional group surrogate, indicates they are scarce (threshold = 0.5, Table 2; Appendix Table, B and K = 0.45, PS = 0.53). This is reflected in the relative scarcity of large wood, poorly represented riffles, and the scarcity of rooted plants in Caspar Creek. The scarcity of stable substrates is likely also a factor in the low abundance of filtering collectors in Caspar Creek (Table 3, appendix Table), because they require such locations to set up their filtering stations. The ratio of behavioral drifting macroinvertebrates to accidental drifters is an indicator of the reliable dawn and dusk food supply for macroinvertebrates in the water column to serve as prey of drift-feeding salmonids. In Caspar Creek in October, less than half of the macroinvertebrate fauna was represented by behavior drifting taxa ( Table 3, 21 to 37%) indicating possible less than optimal food supply for drift-feeding salmonids. Taxonomic differences in the macroinvertebrate fauna reported by Bottorff and Knight (1996) and the present study were not great indicating that Caspar Creek has not changed significantly in the ensuing 12 years. The differences observed (Appendix 1 can be attributed to a number of causes. 1) The study by Bottorff and Knight (1996) was conducted over 8 years and the longer time frame and greater number of samples increased the probability of collecting rarer taxa, for example the large megalopteran predator Dysmicohermes. 2) Changes in the taxonomy resulting over the 12 years, for example Bottorff and Knight (1996) used Merritt et al. (1996, 3rd edition) and the present study used Merritt et al. (2008, 4th edition). This is reflected in changes in groups such as the mayflies and caddisflies. 3) The use of artificial substrates by Bottorff and Knight (1996), namely rock baskets and leaf packs, increased the probability of attracting and concentrating riffle forms and litter-feeding taxa (shredders). 4) Sampling with a D-frame net used in the present study allowed for the collection of surface skating forms, such as Gerridae and Gyrinidae, which is unlikely when artificial substrates are used because the surface skaters are lost when the substrates are removed from the water.
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